100021002123 has 16 divisors (see below), whose sum is σ = 152430543360. Its totient is φ = 57148262976.

The previous prime is 100021002113. The next prime is 100021002143. The reversal of 100021002123 is 321200120001.

It is not a de Polignac number, because 100021002123 - 2¹⁷ = 100020871051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100021002099 and 100021002108.

It is not an unprimeable number, because it can be changed into a prime (100021002113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85458 + ... + 455351.

It is an arithmetic number, because the mean of its divisors is an integer number (9526908960).

Almost surely, 2^100021002123 is an apocalyptic number.

100021002123 is a deficient number, since it is larger than the sum of its proper divisors (52409541237).

100021002123 is an equidigital number, since it uses as much as digits as its factorization.

100021002123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549626.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 100021002123 its reverse (321200120001), we get a palindrome (421221122124).

The spelling of 100021002123 in words is "one hundred billion, twenty-one million, two thousand, one hundred twenty-three".